Vehicle transmission



Jan. 4, I M. BRAEN VEHICLE TRANSMISSION Filed March 5, 1926 PSneet$Sheev 1 WITNESS yum/ma or vleg/ N mmflmBTa n Errorw Jan, 4, 1927.

1,612,799 M. BRAEN VEHICLE TRANSMI S SION 2 Sheets-Sheet 2 Filed March5, 1926 kifima L ATTORNEY Patented Jan. 4, 1927.

' UNITED STATES PATENT orrice.

MARTIN BRAEN, F HAWTHORNE, NEW JERSEY.

VEHICLE 'rnnnsmrssron.

Application filed March 3, 1926. Serial No. 91,941.

This invention relates to mechanism. for all as usual. Ne thus have arotary driven preventing inadvertent backing of an autosystem, includingshaft 4, adapted to be mobile, as when the propeller shaft is disrotatedforwardly or backwardly by or be connected from the engine when thevehicle entirely disconnected from its driving means,

is on a backwardly sloping grade. One obincludin shaft 3. Said system,in the ex- 60 ject of the invention is-to provide a detent ampleillustrated, includes a member (12) for automatically preventing suchinadvertwhich is splined on a rotary part thereof ent backing whichshall be reliable and efli- (shaft 4) so as to be shiftable lengthwisecient andsilent'in its operation. Another of the axis of rotation. Iarrange on the 1o oi ieet is to provide for rendering said defixedstructure of the mechanism a detent 5 vice inoperative when the vehicleis hacked to cooperate with a part of said system in at either under itsown power or by man-power. manner to prevent backward rotation there- Inthe accompanying drawings, of, and in the present example this detentFig. 1 is a side elevation, partly in seccooperates with and par-takesof the sliding tion, of the transmission mechanism of movement of thesplined rotary part men- 7 0 an automobile, withv the invention appliedtioned. Thus:

thereto; A-shaft 18 is fixed in the casing 2 parallel Fig. 2 is asection on line 2---2, Fig. 1, with the other shafts and laterallythereof looking to the left; (Fig. On this shaft and free to slide Fig.3 is a plan, partly in section; lengthwise thereof is fulcramed a forked7 Fig. 4. shows a detail; and lever 19- whose two arms or cheeks receiveFigs. 5, 6 and 7 show details of the menthe gear 12, bearing with somefriction tioned detent. j a ainst its side faces. Between the cheeks 1is the floor of an automobile body and 0 this lever is journaled apinion 20. which 2 the casing, below the floor, for the gearmeshes witha toothed segment 21 concening and other parts of the transmission triowith 18 and, by bearing against the side mechanism; 3 is the motorshaft, 4 the proof the casing as shown in Fig. 2, being held pellershaft, 5 the countershaft, and 6 the from rotation, so that it is ineffect a part jack-shaft. What is known as the standof the fixedstructure.- l'Vhen gear 12 is ard type of transmission is shown by wayturning in the anti-clockwise direction in of example, that is to say:Shafts 3 and 5 l1 ig. 2, for forward driving ofthe vehicle, arepermanently connected'through gears 7 the detent thus-formed is by thefriction and 8 thereon; and shafts 5 and 6 are permapresent between thegear and lever cheeks I nently connected through gears 9 and 10elevated, pinion QO'clearing the gear; but if 05 thereon, shafttialsocarrying a gear 11. On gear 12 turns'clockwise,-as in inadvertent shaft4 is splined a gear 12 whiclnmay be backing of the vehicle, the frictiondepresses shifted from the neutral position (shown, the lever and pinion20 engages thegear and Fig. 1) forward into engagement with 9, in eifectbecolnesra chock between 12 and 21 whereby shaft 4 will be drivenforward from and holds the gearagainst rotation. I preshaft 3, orbackward into engagementwith fer this construction of detent in place ofa 95. gear 11, whereby shaft 4 will bedriven replain pawl to engagethe'teeth of 12 since its versely from shaft 3. The invention is notlocking or detent action is certain and oheoncerned with other forwardspeeds postains with less danger of stripping the gear sible than by theinter-meshing of 12 with 9, or otherwise injuring the parts. Since the45 but for this purpose there is shown fixed friction mentioned holdsthe detent out of on shaft 5 a gear 13 and on shaft 4 a splinedoperative position when the gear 12 is turngear 14 which may be shiftedinto engage ing in the forward direction the operation is ment with 13,to produce second speed, or then noiseless and wear of the gearteeth isinto engagement at 1 5 with gear 7 to proavoided. duce third or highestspeed. The sliding The detent should be thrown out of action forks forshifting the gears 12 and 13 are when the mechanism is to beintentionally indicated at 16. and at.17 is the gear-shift backed,either by setting the transmission lever f-nlcrumed in the floor l tomove forfor that purpose or when backed by manward and backward and alsolaterall', to power. Hence the lever 19 has an arm 19' 55 engage one andclear the other of the fhrks, equipped with a roller 19". And thisroller is adapted to bear against a bar 2r'2 which I ISIDOIIHQHYarranged on the top of the casing in such an oblique position that inplan it converges rearwardly with respectto the shaft 18 on which thedetent is fulcrnmed and slidable; Therefore when the gear 12 is shiftedrearwardly to place the transmission mechanism in reverse and the detentpartakes of the movement this bar acts, through the roller and detentarm, to cam back the detent clear of the gear 12, so as not to obstructthe backward rotation of the gear in such a case. The bar 22 may he.pivoted on a stud 23 at its rear end and it may have its forward endconnected by a slot-and-pin connection with a transversely moving bar 24slidable in the casing and having a hand-lever 25.-sui tably fulcrumed,connected with one end thereof, said hand lever projecting up throughthe floorl and having an operating knob 26. When lever 25 is shiftedtobring bar 22 into the dotted line position in Fig. tithe detent isobviously thrown out of action; the lever may be held in this position bythe catch-plate 27 shown in Fig. 4. Bar 22 is supported against,displacement under the pressure of the detent when the latter isautomatically shifted out of action on placing the transmission inreverse by bar 24 which has a collar 24 at that time engaging the casing2.

Having thus fully described my invention what I claim and desire tosecure by Letters Patent is:

1. In combination, with the fixed structure and a forwardly andbackwardly rotative rotary part of the rotary system of an automobile, adetent movable into and out of chocking relation to said structure andsaid part and including a lever fulcrumcd in said structure and a rotarymember journaled in the lever both on axes parallel with that of saidpart. said structure including an arcuate surface peripherally engagedby said member and concentric with the axis oflfthe lever.

The combination, with'the rotary propelier member of an automobile, agear splined and shiftable thereon, anda drn'ing gear into drivingengagement with which the splined gear is shiftable, of means o Y checkrotation of the first gear when dispeller member of an splined gear;

engaged from the driving gear including a detent shiftable with thesplined gear. 7

The combination, with the rotary proautomobile, a gear splined andshiftable thereon, and a driving gear into driving engagement with whichthe splined gear is shiftable, of means, including a detent shiftable.with the splined gear, the check rotation of the splined gear whendisengaged from .the driving gear, said detent being also movable out ofsaid' relation to the splined gear, and means to move said detent out ofsaid relation during shifting thereof with the splined gear.

4. The combination, with the rotary propeller member of an automobile, agear splired and shiftable thereon, and a driving gear into drivingengagement with which the splined gear is shiftable, of means, includinga detent shiftable with the splined gear, to check rotation of thesplined gear when disengaged from the driving gear,

said dvl'ent being also movable out of said relation to the splinedgear, and relatively fixed means to cam said detent out of said relationduring shifting thereof with the 5. The combination, with a rotary partof the rotary driven system of an automobile,

movable into and out of engagement therewith, and means, including apivoted device toward which the detentmoves into engagement with saidpart and itself movable in the relatively opposite direction, for movingthe detent out of such engagement.

(3. The combination, with the rotary pr0- peller member of anautomobile, a gear splined and shiftable thereon, and a driving gearinto driving engagement with which the splined gear is shiftable, ofmeans, including a detent shiftable with the s lined gear, to checkrotation of the spline gear when disengaged from the driving gear, saiddrl'cnt being also movable out of said relalion to the splined gear, andmeans to move said dclcnt out of said relation including a ramming deyice oblique to the path of shifting of the detent and also pivotallymovable to move said (let-cut out of said relation.

In testimony whereof I aifix my signature.

MARTIN BRAEN.

H of a detent to check rotation of said part

